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Lu J, Pan Q, Zhu S, Liu R, Zhu H. Ligand-Mediated Photophysics Adjustability in Bis-tridentate Ir(III) Complexes and Their Application in Efficient Optical Limiting Materials. Inorg Chem 2021; 60:12835-12846. [PMID: 34428896 DOI: 10.1021/acs.inorgchem.1c01142] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A family of novel bis-tridentate Ir(III) complexes (Ir1-Ir5) incorporating both functional N∧C∧N-type ligands (L1-L5) and N∧N∧C-type ligand (L0) were synthesized attentively and characterized scientifically. The crystalline structures of Ir1, Ir3 and Ir4 were resoundingly confirmed by XRD. With the aid of experimental and theoretical methods, their photophysical properties at transient and steady states were scientifically investigated. The broadband charge-transfer absorption for these aforementioned Ir(III) complexes is up to 600 nm as shown in the UV-visible absorption spectrum. The emission lifetimes of their excited states are good. Between the visible and near-infrared regions, Ir1-Ir5 possessed powerful excited-state absorption. Hence, a remarkably robust reverse saturable absorption (RSA) process can occur once the complexes are irradiated by a 532 nm laser. The RSA effect follows the descending order: Ir3 > Ir5 > Ir4 ≈ Ir1 > Ir2. To sum up, modifying electron-donating units (-OCH3) and large π-conjugated units to the pyridyl N∧C∧N-type ligands is a systematic way to markedly raise the RSA effect. Therefore, these octahedral bis-tridentate Ir(III) complexes are potentially state-of-the-art optical limiting (OPL) materials.
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Affiliation(s)
- Jiapeng Lu
- College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 211816, China
| | - Qianqian Pan
- College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 211816, China
| | - Senqiang Zhu
- College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 211816, China
| | - Rui Liu
- College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 211816, China
| | - Hongjun Zhu
- College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 211816, China
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Doistau B, Jiménez JR, Guerra S, Besnard C, Piguet C. Key Strategy for the Rational Incorporation of Long-Lived NIR Emissive Cr(III) Chromophores into Polymetallic Architectures. Inorg Chem 2020; 59:1424-1435. [PMID: 31909978 DOI: 10.1021/acs.inorgchem.9b03163] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The CrIIIN6 chromophores are particularly appealing for low-energy sensitization via energy transfer processes since they show extremely long excited state lifetimes reaching the millisecond range in the technologically crucial near-infrared domain. However, their properties were barely harnessed in multimetallic structures because of the lack of both monitoring methods and accessible synthetic pathways. We herein report a remedy to monitor and control the formation of CrIII-containing assemblies in solution via the design of a CrIIIN6 inert "complex-as-ligand" that can be included into polymetallic architectures. As a proof of concept, these CrN6 building blocks were reacted in solution with ZnII or FeII to give extended trinuclear linear Cr-M-Cr assemblies, the structure of which could be addressed by NMR spectroscopy despite the presence of two slowly relaxing CrIII paramagnetic centers. In addition to long CrIII excited state lifetimes and weak sensitivity to oxygen quenching, these polymetallic assemblies display controlled CrIII to MII energy transfers, which pave the way for use of the "complex-as-ligand" strategy for introducing photophysically active CrIII probes into light-converting polymetallic devices.
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Affiliation(s)
- Benjamin Doistau
- Department of Inorganic and Analytical Chemistry , University of Geneva , 30 quai Ernest Ansermet , CH-1211 Geneva 4 , Switzerland
| | - Juan-Ramón Jiménez
- Department of Inorganic and Analytical Chemistry , University of Geneva , 30 quai Ernest Ansermet , CH-1211 Geneva 4 , Switzerland
| | - Sebastiano Guerra
- Department of Inorganic and Analytical Chemistry , University of Geneva , 30 quai Ernest Ansermet , CH-1211 Geneva 4 , Switzerland
| | - Céline Besnard
- Laboratory of Crystallography , University of Geneva , 24 quai Ernest Ansermet , CH-1211 Geneva 4 , Switzerland
| | - Claude Piguet
- Department of Inorganic and Analytical Chemistry , University of Geneva , 30 quai Ernest Ansermet , CH-1211 Geneva 4 , Switzerland
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Abstract
A new synthetic approach to hetero-aryl substituted carbyne complexes has allowed the synthesis of bipyridyl functionalised carbynes and bis(carbynes) with three potential sites for metal coordination to either the two pyridyl donors or the WC bond.
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Affiliation(s)
- Benjamin J. Frogley
- Research School of Chemistry
- Australian National University
- Canberra
- Australian Capital Territory
- Australia
| | - Anthony F. Hill
- Research School of Chemistry
- Australian National University
- Canberra
- Australian Capital Territory
- Australia
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Scattergood PA, Roberts J, Omar SAE, Elliott PIP. Observation of an Inversion in Photophysical Tuning in a Systematic Study of Luminescent Triazole-Based Osmium(II) Complexes. Inorg Chem 2019; 58:8607-8621. [PMID: 31180230 DOI: 10.1021/acs.inorgchem.9b00915] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
In a systematic survey of luminescent bis(terdentate) osmium(II) complexes, a tipping point involving a reversal in photophysical tuning is observed whereby increasing stabilization of the ligand-based lowest unoccupied molecular orbital (LUMO) results in a blue shift in the optical absorption and emission bands. The complexes [Os(N^N'^N″)2]2+ [N^N'^N″ = 2,6-bis(1-phenyl-1,2,3-triazol-4-yl)pyridine (Os1), 2,6-bis(1-benzyl-1,2,3-triazol-4-yl)pyrazine (Os2), 6-(1-benzyl-1,2,3-triazol-4-yl)-2,2'-bipyridyl (Os3), 2-(pyrid-2-yl)-6-(1-benzyl-1,2,3-triazol-4-yl)pyrazine (Os4), 2-(pyrazin-2-yl)-6-(1-benzyl-1,2,3-triazol-4-yl)pyridine (Os5), and 6-(1-benzyl-1,2,3-triazol-4-yl)-2,2'-bipyrazinyl (Os6)] have been prepared and characterized, and all complexes display phosphorescence ranging from the orange to near-IR regions of the spectrum. Replacement of the central pyridine in the ligands of Os1 by the more π-accepting pyrazine in Os2 results in a 55 nm red shift in the triplet metal-to-ligand charge-transfer-based emission band, while a larger red shift of 107 nm is observed for the replacement of one of the triazole donors in the ligands of Os1 by a second pyridine ring in Os3 (λemmax = 702 nm). Interestingly, replacement of the central pyridine ring in the ligands of Os3 by pyrazine (Os4, λemmax = 702 nm) fails to result in a further red shift in the emission band. Reversal of the relative positions of the pyridine and pyrazine donors in Os5 (λemmax = 733 nm) compared to Os4 does indeed result in the expected red shift in the emission with respect to that for Os3 based on the increased π-acceptor character of the ligands present. However, an inversion in emission tuning is observed for Os6, in which the incorporation of a second pyrazine donor in the ligand architecture results in a blue shift in the optical absorption and emission maxima (λemmax = 710 nm). Electrochemical studies reveal that while incorporating pyrazine in the ligands indeed results in an expected anodic shift in the first reduction potential through stabilization of the ligand-based LUMO, there is also a concomitant anodic shift in the OsII/OsIII-based oxidation potential. This stabilization of the metal-based highest occupied molecular orbital (HOMO) thus nullifies the effect of stabilization of the LUMO in Os4 compared to Os3, resulting in these complexes having coincident emission maxima. For Os6, stabilization of the HOMO through the incorporation of two pyrazine donors in the ligand structure now exceeds stabilization of the LUMO, resulting in a larger HOMO-LUMO gap and a counterintuitive blue shift in the optical properties in comparison with those of Os5. While it is known that the replacement of ligands (e.g., replacing bipyridyl with bipyrazinyl) can result in a larger HOMO-LUMO energy gap through greater stabilization of the HOMO, these results importantly allow us to capture the tipping point at which this inversion in photophysical tuning occurs. This therefore enables us to explore the limits available in emission tuning with a relatively simple and minimalist ligand structure.
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Baggi N, Garoni E, Colombo A, Dragonetti C, Righetto S, Roberto D, Boixel J, Guerchais V, Fantacci S. Design of cyclometallated 5-π-delocalized donor-1,3-di(2-pyridyl)benzene platinum(II) complexes with second-order nonlinear optical properties. Polyhedron 2018. [DOI: 10.1016/j.poly.2017.11.051] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Meng FY, Hsu YH, Zhang Z, Wu PJ, Chen YT, Chen YA, Chen CL, Chao CM, Liu KM, Chou PT. The Quest of Excited-State Intramolecular Proton Transfer via Eight-Membered Ring π-Conjugated Hydrogen Bonding System. Chem Asian J 2017; 12:3010-3015. [PMID: 28980416 DOI: 10.1002/asia.201701057] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 10/02/2017] [Indexed: 11/05/2022]
Abstract
Searching for eight-membered ring π-conjugated hydrogen bonding (8-MR H-bonding) systems with excited-state intramolecular proton transfer (ESIPT) property is seminal and synthetically challenging. In this work, a series of π-conjugated molecules (8-HB-1, 8-HB-L1 and 8-HB-2) potentially possessing 8-MR H-bonding are strategically designed, synthesized and characterized. The configurations of these three potential molecules are checked by their X-ray structures, among which 8-HB-L1 (a structurally locked 8-HB-1 core chromophore) is proved to be an 8-MR H-bonding system, whereas 8-HB-1 and 8-HB-2 are too sterically hindered to form the 8-MR intramolecular H-bond. The ESIPT property of 8-HB-L1 is confirmed by the dual fluorescence consisting of normal and proton-transfer tautomer emissions. The insight into the ESIPT process of 8-HB-L1 is provided by femtosecond fluorescence upconversion measurements together with computational simulation. The results demonstrate for the first time a successful synthetic route to attain the 8-MR H-bonding molecule 8-HB-L1 with ESIPT property.
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Affiliation(s)
- Fan-Yi Meng
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan, R.O.C
| | - Yen-Hao Hsu
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan, R.O.C
| | - Zhiyun Zhang
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan, R.O.C
| | - Pei-Jhen Wu
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan, R.O.C
| | - Yi-Ting Chen
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan, R.O.C
| | - Yi-An Chen
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan, R.O.C
| | - Chi-Lin Chen
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan, R.O.C
| | - Chi-Min Chao
- Department of Medical Applied Chemistry, Department of Medical Education, Chung Shan Medical University, Taichung, 40201, Taiwan, R.O.C
| | - Kuan-Miao Liu
- Department of Medical Applied Chemistry, Department of Medical Education, Chung Shan Medical University, Taichung, 40201, Taiwan, R.O.C
| | - Pi-Tai Chou
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan, R.O.C
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de Boer SY, Korstanje TJ, La Rooij SR, Kox R, Reek JNH, van der Vlugt JI. Ruthenium PNN(O) Complexes: Cooperative Reactivity and Application as Catalysts for Acceptorless Dehydrogenative Coupling Reactions. Organometallics 2017; 36:1541-1549. [PMID: 29353952 PMCID: PMC5770139 DOI: 10.1021/acs.organomet.7b00111] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Indexed: 11/30/2022]
Abstract
![]()
The novel tridentate
PNNOH pincer ligand LH features a reactive 2-hydroxypyridine functionality
as well as a bipyridyl-methylphosphine skeleton for meridional coordination.
This proton-responsive ligand coordinates in a straightforward manner
to RuCl(CO)(H)(PPh3)3 to generate complex 1. The methoxy-protected analogue LMe was also coordinated to Ru(II) for comparison. Both
species have been crystallographically characterized. Site-selective
deprotonation of the 2-hydroxypyridine functionality to give 1′ was achieved using both mild (DBU) and strong bases
(KOtBu and KHMDS), with no sign of involvement of the phosphinomethyl
side arm that was previously established as the reactive fragment.
Complex 1′ is catalytically active in the dehydrogenation
of formic acid to generate CO-free hydrogen in three consecutive runs
as well as for the dehydrogenative coupling of alcohols, giving high
conversions to different esters and outperforming structurally related
PNN ligands lacking the NOH fragment. DFT calculations
suggest more favorable release of H2 through reversible
reactivity of the hydroxypyridine functionality relative to the phosphinomethyl
side arm.
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Affiliation(s)
- Sandra Y de Boer
- Homogeneous, Supramolecular & Bio-inspired Catalysis, van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Ties J Korstanje
- Homogeneous, Supramolecular & Bio-inspired Catalysis, van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Stefan R La Rooij
- Homogeneous, Supramolecular & Bio-inspired Catalysis, van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Rogier Kox
- Homogeneous, Supramolecular & Bio-inspired Catalysis, van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Joost N H Reek
- Homogeneous, Supramolecular & Bio-inspired Catalysis, van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Jarl Ivar van der Vlugt
- Homogeneous, Supramolecular & Bio-inspired Catalysis, van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
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Sues PE, John JM, Bukhryakov KV, Schrock RR, Müller P. Molybdenum and Tungsten Alkylidene Complexes That Contain a 2-Pyridyl-Substituted Phenoxide Ligand. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00644] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Peter E. Sues
- Department
of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Jeremy M. John
- Department
of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Konstantin V. Bukhryakov
- Department
of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Richard R. Schrock
- Department
of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Peter Müller
- Department
of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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Hayasaka K, Kamata K, Nakazawa H. Highly Efficient Olefin Hydrosilylation Catalyzed by Iron Complexes with Iminobipyridine Ligand. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2016. [DOI: 10.1246/bcsj.20150359] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Kazumasa Hayasaka
- Department of Chemistry, Graduate School of Science, Osaka City University
| | - Kouji Kamata
- Department of Chemistry, Graduate School of Science, Osaka City University
| | - Hiroshi Nakazawa
- Department of Chemistry, Graduate School of Science, Osaka City University
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Chakrabarti K, Paul B, Maji M, Roy BC, Shee S, Kundu S. Bifunctional Ru(ii) complex catalysed carbon–carbon bond formation: an eco-friendly hydrogen borrowing strategy. Org Biomol Chem 2016; 14:10988-10997. [DOI: 10.1039/c6ob02010k] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Bifunctional Ru(ii) complex (0.1 mol%) catalysed one-pot β-alkylation of secondary alcohols with primary alcohols and double alkylation of cyclopentanol were carried out successfully following the atom economical borrowing hydrogen methodology.
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Affiliation(s)
- Kaushik Chakrabarti
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208016
- India
| | - Bhaskar Paul
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208016
- India
| | - Milan Maji
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208016
- India
| | - Bivas Chandra Roy
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208016
- India
| | - Sujan Shee
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208016
- India
| | - Sabuj Kundu
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208016
- India
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